CN107253475B - Torque distribution method and torque distribution controller for hybrid electric vehicle - Google Patents
Torque distribution method and torque distribution controller for hybrid electric vehicle Download PDFInfo
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- CN107253475B CN107253475B CN201710428557.9A CN201710428557A CN107253475B CN 107253475 B CN107253475 B CN 107253475B CN 201710428557 A CN201710428557 A CN 201710428557A CN 107253475 B CN107253475 B CN 107253475B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Abstract
The invention provides a torque distribution method and a torque distribution controller for a hybrid electric vehicle, wherein the torque distribution controller performs distribution control on torque by adopting the torque distribution method, and the torque distribution method comprises the following steps: step A, analyzing according to the opening degree of an accelerator pedal to obtain an original required torque; b, performing drivability processing on the original required torque to obtain a driver required torque; step C, calculating the steady-state demand torque of the engine according to the original demand torque, and taking the steady-state demand torque of the engine as the execution torque of the engine; and D, calculating a difference value obtained by subtracting the actual torque of the engine from the torque required by the driver, taking the difference value as the execution torque of the motor when the difference value is not less than zero, and controlling the motor to enter a power generation mode when the difference value is less than zero. The torque distribution method is based on the torque required by the driver, adopts the dynamic torque distribution strategy of optimized calculation, and reasonably distributes the torque to the engine and the motor, thereby improving the working efficiency of the hybrid power system.
Description
Technical Field
The invention relates to the technical field of hybrid electric vehicles, in particular to a torque distribution method and a torque distribution controller for a hybrid electric vehicle.
Background
With the increasing severity of the problems of global energy shortage, automobile emission pollution and the like, new energy automobiles with low energy consumption and low emission are promoted to become a consensus of all circles. In the scheme of the new energy automobile power system, a strong mixing system is a good choice at present. In a strong hybrid system, the power configuration typically employs a smaller engine and a large torque, high power electric machine. When the engine responds to the requirements of a driver, the power is insufficient, the torque response is slow, and the motor is required to do certain assistance, so that the dynamic torque distribution needs to be performed on the engine and the motor in the dynamic process in order to meet the requirements of the driver on the dynamic property.
The intensive mixing system generally has a pure electric driving mileage of 50 to 80 kilometers, and can enter a hybrid driving working mode when the electric quantity is reduced to a certain degree. The forced mixing system considers a certain pure electric mileage and achieves higher energy-saving and emission-reducing effects. And the vehicle using condition is not limited by the shortage of the current charging facilities, so the method has a huge application prospect.
In summary, how to provide a torque distribution method in a hybrid driving operating mode, and optimize an engine operating range through a reasonable energy distribution strategy, so as to improve the operating efficiency of the whole system, is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a torque distribution method and a torque distribution controller for a hybrid vehicle, where the torque distribution controller performs distribution control on torque by using the torque distribution method, and the torque distribution method is based on a torque required by a driver, and reasonably distributes the torque to an engine and a motor by using an optimally calculated dynamic torque distribution strategy, so as to improve the working efficiency of a hybrid system.
In order to achieve the purpose, the invention provides the following technical scheme:
a torque distribution method for a hybrid vehicle, comprising:
step A, analyzing according to the opening degree of an accelerator pedal to obtain an original required torque;
b, performing drivability processing on the original required torque to obtain a driver required torque;
step C, calculating steady-state demand torque of the engine according to the original demand torque, and taking the steady-state demand torque of the engine as execution torque of the engine;
and D, calculating a difference value obtained by subtracting the actual torque of the engine from the torque required by the driver, taking the difference value as the execution torque of the motor when the difference value is not less than zero, and controlling the motor to enter a power generation mode when the difference value is less than zero.
Preferably, in the above-mentioned torque distribution method, before step a, further comprising: judging whether the whole vehicle system meets preset enabling conditions, wherein the preset enabling conditions are as follows:
the powertrain is in a torque drive mode; and is
The engine is in a running state; and is
The electric system meets the preset power generation assisting condition.
Preferably, in the above-described torque distribution method, the preset power generation assisting condition is:
the residual electric quantity of the battery is greater than the lowest allowable generating electric quantity of the whole vehicle system; and is
The available generating power of the battery is larger than the lowest using generating power of the whole vehicle system; and is
The available charging power of the motor is larger than the lowest used charging power of the whole vehicle; and is
The maximum generating torque and the maximum boosting torque of the motor are both larger than a preset threshold value.
A torque distribution controller for a hybrid vehicle, comprising:
the receiving module is used for receiving an execution torque of an engine and a driver required torque, wherein the execution torque of the engine is the calculated steady-state required torque of the engine;
the processing module is used for calculating a difference value obtained by subtracting the actual torque of the engine from the torque required by the driver, obtaining a first signal taking the difference value as the execution torque of the motor when the difference value is not less than zero, and obtaining a second signal for controlling the motor to enter a power generation mode when the difference value is less than zero;
and the signal sending module is used for sending the first signal and the second signal to the motor.
Preferably, the torque distribution controller further includes an enable determining module for determining a preset enable condition, where the preset enable condition is specifically:
the powertrain is in a torque drive mode; and is
The engine is in a running state; and is
The electric system meets the preset power generation assisting condition.
Preferably, the torque distribution controller further includes a power generation assisting judgment module for judging the preset power generation assisting condition, the power generation assisting judgment module is electrically connected to the enabling judgment module, and the preset power generation assisting condition is as follows:
the residual electric quantity of the battery is greater than the lowest allowable generating electric quantity of the whole vehicle system; and is
The available generating power of the battery is larger than the lowest using generating power of the whole vehicle system; and is
The available charging power of the motor is larger than the lowest used charging power of the whole vehicle; and is
The maximum generating torque and the maximum boosting torque of the motor are both larger than a preset threshold value.
Preferably, the torque distribution controller further includes a drivability module electrically connected to the receiving module, and the drivability module is configured to receive an original required torque obtained by analyzing an opening degree of an accelerator pedal, and perform drivability processing on the original required torque to obtain the driver required torque.
According to the technical scheme, the torque distribution method for the hybrid electric vehicle provided by the invention has the advantages that the engine actually executes the steady-state required torque of the engine calculated by the energy management unit, and the working mode of the motor is changed according to the mutual magnitude relation between the required torque of a driver and the executed torque of the engine, so that the engine can work efficiently, and meanwhile, the function of the motor is reasonably distributed, and the working efficiency of a hybrid electric system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a torque distribution method for a hybrid vehicle according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating execution of a torque distribution function module for a hybrid vehicle according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating the result of a torque distribution method for a hybrid vehicle according to an embodiment of the present invention.
Detailed Description
For the purpose of facilitating understanding, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, a schematic diagram of a torque distribution method for a hybrid vehicle according to an embodiment of the present invention is provided, and the torque distribution method includes the following steps:
and step A, analyzing the original torque demand of the driver, namely analyzing the original demand torque according to the opening of an accelerator pedal.
The original driver required torque is analyzed, namely, after the proportion of the actual opening degree of the accelerator pedal to the designed total opening degree of the accelerator pedal is detected, the proportion value is multiplied by the maximum driving torque value of the whole vehicle system, and the product is the original driver required torque.
And step B, carrying out the drivability processing of the required torque, namely carrying out the drivability processing on the original required torque obtained in the step A to obtain the required torque of the driver.
The drivability processing is the prior art and comprises Tip-in and Tip-out, wherein the Tip-in is used for carrying out gradient limitation and filtering on the original torque analyzed according to the pedal of a driver, so that the smoothness of torque rise is ensured; the Tip-out is that when the driver releases the accelerator, the original required torque is subjected to gradient limitation and filtering of different parameters, and smoothness of torque reduction is guaranteed.
And C, energy management steady-state torque distribution, namely calculating the steady-state required torque of the engine according to the original required torque obtained in the step A, and taking the steady-state required torque of the engine as the execution torque of the engine.
"taking the engine steady-state required torque as the execution torque of the engine" means that the VCU (Vehicle Control Unit) sends the engine steady-state required torque to an ECU (Electrical Control Unit), and the ECU adjusts a throttle and an ignition angle using the received engine steady-state required torque as a Control parameter.
And D, dynamic torque distribution, namely calculating the difference value of subtracting the actual torque of the engine from the driver required torque, taking the difference value as the execution torque of the motor (the motor required torque in the figure 1) when the difference value is not less than zero, and controlling the motor to enter a power generation mode when the difference value is less than zero.
The "actual engine torque" refers to the torque actually provided by the engine during the execution process after the ECU sends out the control signal, and in the prior art, the "actual engine torque" can be detected and sent to the VCU as the control parameter of the VCU. In practice, there is typically some deviation of the "engine actual torque" from the "engine steady-state required torque".
Referring to fig. 2, an execution flow chart of a torque distribution function module for a hybrid electric vehicle according to an embodiment of the present invention is designed according to the torque distribution method provided by the present invention, and the specific execution flow includes: s1, receiving the function-related signals; s2, judging a function enabling condition; s3, torque distribution strategy; and S4, judging the function exit condition.
The following description is made for each of S1 to S4:
s1, function-related signal reception.
The function related signals are used for judging whether the power assembly meets the enabling conditions of the function module, and the received signals comprise battery electric quantity, available discharging power, available charging power, maximum generating torque of the motor, maximum boosting torque of the motor, engine state (running or non-running), gear positions and accelerator pedal signals.
S2, function enable condition judgment.
The present embodiment is directed to dynamic torque distribution of the strong hybrid system during parallel driving, so the conditions for entering this function are:
a. the electric system has enough power generation and assistance capacity; and is
b. The power system is in a parallel driving state; and is
c. The whole vehicle is in the driving process but not in the idling speed control process.
The condition a is to determine that the electrical system has sufficient power generation and boosting capabilities, in general, from the following aspects:
the residual electric quantity of the battery is greater than the lowest allowable generating electric quantity of the whole vehicle system; and is
The available generating power of the battery is larger than the lowest using generating power of the whole vehicle system; and is
The available charging power of the motor is larger than the lowest used charging power of the whole vehicle; and is
The maximum generating torque and the maximum boosting torque of the motor are both larger than a preset threshold value.
In the condition b, that the power system is in the parallel driving state means that the engine is in the running state. When the engine is in a non-running state, the electric drive mode is the pure electric drive mode.
And the condition c is judged according to the gear and an accelerator pedal signal, power is output when the gear drives the gear D/R, and a certain accelerator is stepped on, so that the power system can enter a torque driving mode instead of a rotating speed control mode in idling and crawling.
S3, torque distribution strategy.
The torque distribution strategy is that the engine steady-state demand torque calculated by the energy management unit is used as the execution torque of the engine; and taking the difference value of the driver required torque minus the engine execution torque as the motor required torque, if the motor required torque is a value not less than zero, the motor enters a power-assisted mode, and if the motor required torque is a value less than zero, the motor enters a power generation mode.
The specific implementation of the torque distribution strategy can be referred to the description of fig. 1 above, and is not repeated herein.
Referring to fig. 3, which is a schematic diagram of the execution result of the allocation strategy of the embodiment, as can be seen from fig. 3, the motor performs different functions with the change of the torque required by the driver, and when the engine starts to respond, the motor enters the boost mode to provide the boost torque; when the engine responds for a certain time, the engine independently provides driving force, and the motor enters a power generation mode; as can be seen from the right part of the figure, the electric machine enters the boost mode again when the actual torque of the engine is less than the driver demanded torque.
And S4, judging the function exit condition.
The function exit condition corresponds to an enable condition, namely:
d. the electric system has insufficient power generation and assistance capacity; or
e. The power system is not in a parallel driving state; or
f. The whole vehicle is not in the driving process but in the idling speed control process.
In the torque distribution method for the hybrid electric vehicle, the engine actually executes the steady-state required torque of the engine calculated by the energy management unit, and the working mode of the motor is changed according to the mutual magnitude relation of the required torque of the driver and the execution torque of the engine, so that the engine can work efficiently, and simultaneously the function of the motor is reasonably distributed, thereby improving the working efficiency of the hybrid electric vehicle.
Corresponding to the torque distribution method disclosed in the above embodiment, the present invention also provides a torque distribution controller for a hybrid vehicle, comprising:
the receiving module is used for receiving the execution torque of the engine and the driver required torque, and the execution torque of the engine is the calculated steady-state required torque of the engine;
the processing module is used for calculating a difference value obtained by subtracting the actual torque of the engine from the torque required by the driver, obtaining a first signal taking the difference value as the execution torque of the motor when the difference value is not less than zero, and obtaining a second signal for controlling the motor to enter a power generation mode when the difference value is less than zero;
and the signal sending module is used for sending the first signal and the second signal to the motor.
In a specific embodiment, the torque distribution controller may further include an enable determining module, configured to determine a preset enable condition, where the preset enable condition is specifically:
the powertrain is in a torque drive mode; and is
The engine is in a running state; and is
The electric system meets the preset power generation assisting condition.
Of course, in order to reduce the complexity of the enabling determination module, a power generation assisting determination module for determining a preset power generation assisting condition may be additionally provided, and the power generation assisting determination module is electrically connected to the enabling determination module, so that the enabling determination module may receive a determination result of the power generation assisting condition from the power generation assisting determination module when determining the preset enabling condition.
In a specific embodiment, the preset power generation assisting conditions are as follows:
the residual electric quantity of the battery is greater than the lowest allowable generating electric quantity of the whole vehicle system; and is
The available generating power of the battery is larger than the lowest using generating power of the whole vehicle system; and is
The available charging power of the motor is larger than the lowest used charging power of the whole vehicle; and is
The maximum generating torque and the maximum boosting torque of the motor are both larger than a preset threshold value.
The invention provides a torque distribution controller, wherein a receiving module is used for receiving a torque required by a driver, and a drivability module electrically connected with the receiving module can be arranged for receiving an original required torque obtained by analyzing the opening degree of an accelerator pedal and performing drivability processing on the original required torque to obtain the torque required by the driver.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. A torque distribution method for a hybrid vehicle, characterized by comprising:
step A, analyzing according to the opening degree of an accelerator pedal to obtain an original required torque;
b, performing drivability processing on the original required torque to obtain a driver required torque;
step C, calculating steady-state demand torque of the engine according to the original demand torque, and taking the steady-state demand torque of the engine as execution torque of the engine;
step D, calculating a difference value obtained by subtracting the actual torque of the engine from the torque required by the driver, taking the difference value as the execution torque of the motor when the difference value is not less than zero, and controlling the motor to enter a power generation mode when the difference value is less than zero;
before the step A, the method further comprises the following steps: judging whether the whole vehicle system meets preset enabling conditions, wherein the preset enabling conditions are as follows:
the powertrain is in a torque drive mode; and is
The engine is in a running state; and is
The electric system meets the preset power generation assisting condition;
the preset power generation assisting conditions are as follows:
the residual electric quantity of the battery is greater than the lowest allowable generating electric quantity of the whole vehicle system; and is
The available generating power of the battery is larger than the lowest using generating power of the whole vehicle system; and is
The available charging power of the motor is larger than the lowest used charging power of the whole vehicle; and is
The maximum generating torque and the maximum boosting torque of the motor are both larger than a preset threshold value.
2. A torque distribution controller for a hybrid vehicle, comprising:
the receiving module is used for receiving an execution torque of an engine and a driver required torque, wherein the execution torque of the engine is the calculated steady-state required torque of the engine;
the processing module is used for calculating a difference value obtained by subtracting the actual torque of the engine from the torque required by the driver, obtaining a first signal taking the difference value as the execution torque of the motor when the difference value is not less than zero, and obtaining a second signal for controlling the motor to enter a power generation mode when the difference value is less than zero;
the signal sending module is used for sending the first signal and the second signal to the motor;
the torque distribution controller further comprises an enabling judgment module for judging preset enabling conditions, wherein the preset enabling conditions are as follows:
the powertrain is in a torque drive mode; and is
The engine is in a running state; and is
The electric system meets the preset power generation assisting condition;
the torque distribution controller further comprises a power generation assisting judgment module used for judging the preset power generation assisting condition, the power generation assisting judgment module is electrically connected with the enabling judgment module, and the preset power generation assisting condition is as follows:
the residual electric quantity of the battery is greater than the lowest allowable generating electric quantity of the whole vehicle system; and is
The available generating power of the battery is larger than the lowest using generating power of the whole vehicle system; and is
The available charging power of the motor is larger than the lowest used charging power of the whole vehicle; and is
The maximum generating torque and the maximum boosting torque of the motor are both larger than a preset threshold value.
3. The torque distribution controller according to claim 2, further comprising a drivability module electrically connected to the receiving module, wherein the drivability module is configured to receive an original required torque parsed from an opening degree of an accelerator pedal, and perform drivability processing on the original required torque to obtain the driver required torque.
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| CN108819724B (en) * | 2018-06-11 | 2020-07-07 | 浙江吉利汽车研究院有限公司 | Regenerative braking control method, vehicle control unit and vehicle |
| CN111452625B (en) * | 2019-01-22 | 2022-12-02 | 上海汽车集团股份有限公司 | Torque control method and device |
| CN112572406B (en) * | 2019-09-27 | 2022-06-10 | 比亚迪股份有限公司 | Method and device for controlling vehicle, storage medium and vehicle |
| CN110834621B (en) * | 2019-10-15 | 2021-03-02 | 中国第一汽车股份有限公司 | Torque distribution control method for light hybrid vehicle, storage medium and vehicle |
| CN111016874B (en) * | 2019-12-05 | 2021-04-16 | 浙江吉利汽车研究院有限公司 | Torque distribution method and torque distribution device for hybrid electric vehicle |
| CN111169457B (en) * | 2019-12-29 | 2021-10-12 | 吉泰车辆技术（苏州）有限公司 | Hybrid power gear shifting control method |
| CN111071237B (en) * | 2019-12-29 | 2021-10-12 | 吉泰车辆技术（苏州）有限公司 | Seamless downshift control method for hybrid system |
| CN111645667B (en) * | 2020-04-23 | 2021-08-31 | 吉泰车辆技术（苏州）有限公司 | Torque control method, device and equipment for parallel mode of hybrid vehicle and vehicle |
| CN112477843B (en) * | 2020-11-24 | 2022-09-06 | 上汽通用五菱汽车股份有限公司 | Torque distribution method, system, device and storage medium for hybrid vehicle |
| CN112977396B (en) * | 2021-03-18 | 2022-04-22 | 中国第一汽车股份有限公司 | Hybrid electric vehicle power generation torque distribution method and hybrid electric vehicle |
| CN113619406A (en) * | 2021-09-02 | 2021-11-09 | 北京汽车集团越野车有限公司 | Control method and device for automobile power-assisted function |
| CN114274942A (en) * | 2022-01-14 | 2022-04-05 | 中国第一汽车股份有限公司 | Method and device for controlling charging and discharging power of battery of hybrid electric vehicle |
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